Buggy code:
@ Deprecated public IndexSchema ( SolrConfig solrConfig , String name ) { } public IndexSchema ( SolrConfig solrConfig , String name , InputSource is ) { } @ Deprecated public SolrConfig getSolrConfig ( ) { } public SolrResourceLoader getResourceLoader ( ) { } public String getResourceName ( ) { } public String getSchemaName ( ) { } float getVersion ( ) { } @ Deprecated public InputStream getInputStream ( ) { } @ Deprecated public String getSchemaFile ( ) { } @ Deprecated public String getName ( ) { } public Map < String , SchemaField > getFields ( ) { } public Map < String , FieldType > getFieldTypes ( ) { } public List < SchemaField > getFieldsWithDefaultValue ( ) { } public Collection < SchemaField > getRequiredFields ( ) { } private SimilarityFactory similarityFactory ; public Similarity getSimilarity ( ) { } public SimilarityFactory getSimilarityFactory ( ) { } public Analyzer getAnalyzer ( ) { } public Analyzer getQueryAnalyzer ( ) { } @ Deprecated public SolrQueryParser getSolrQueryParser ( String defaultField ) { } public String getDefaultSearchFieldName ( ) { } @ Deprecated public String getQueryParserDefaultOperator ( ) { } private SchemaField uniqueKeyField ; public SchemaField getUniqueKeyField ( ) { } private String uniqueKeyFieldName ; private FieldType uniqueKeyFieldType ; public Fieldable getUniqueKeyField ( Document doc ) { } public String printableUniqueKey ( Document doc ) { } private SchemaField getIndexedField ( String fname ) { } public void refreshAnalyzers ( ) { } private class SolrIndexAnalyzer extends Analyzer { protected final HashMap < String , Analyzer > analyzers ; SolrIndexAnalyzer ( ) { } protected HashMap < String , Analyzer > analyzerCache ( ) { } protected Analyzer getAnalyzer ( String fieldName ) { } @ Override public TokenStream tokenStream ( String fieldName , Reader reader ) { } @ Override public TokenStream reusableTokenStream ( String fieldName , Reader reader ) throws IOException { } @ Override public int getPositionIncrementGap ( String fieldName ) { } } private class SolrQueryAnalyzer extends IndexSchema . SolrIndexAnalyzer { @ Override protected HashMap < String , Analyzer > analyzerCache ( ) { } @ Override protected Analyzer getAnalyzer ( String fieldName ) { } } private void readSchema ( InputSource is ) { } private void addDynamicField ( List < IndexSchema . DynamicField > dFields , SchemaField f ) { } private Analyzer constructMultiTermAnalyzer ( Analyzer queryAnalyzer ) { } private static class MultiTermChainBuilder { static final KeywordTokenizerFactory keyFactory ; ArrayList < CharFilterFactory > charFilters = null ; ArrayList < TokenFilterFactory > filters = new ArrayList < TokenFilterFactory > ( 2 ) ; TokenizerFactory tokenizer = IndexSchema . MultiTermChainBuilder . keyFactory ; public void add ( Object current ) { } public TokenizerChain build ( ) { } } public void registerDynamicField ( SchemaField ... f ) { } private void addDynamicFieldNoDupCheck ( List < IndexSchema . DynamicField > dFields , SchemaField f ) { } private boolean isDuplicateDynField ( List < IndexSchema . DynamicField > dFields , SchemaField f ) { } public void registerCopyField ( String source , String dest ) { } public void registerCopyField ( String source , String dest , int maxChars ) { } private void registerDynamicCopyField ( IndexSchema . DynamicCopy dcopy ) { } private static Object [ ] append ( Object [ ] orig , Object item ) { } private Analyzer readAnalyzer ( Node node ) throws XPathExpressionException { } abstract static class DynamicReplacement implements Comparable < IndexSchema . DynamicReplacement > { static final int STARTS_WITH = 1 ; static final int ENDS_WITH = 2 ; final String regex ; final int type ; final String str ; protected DynamicReplacement ( String regex ) { } public boolean matches ( String name ) { } public int compareTo ( IndexSchema . DynamicReplacement other ) { } } static final class DynamicField extends IndexSchema . DynamicReplacement { final SchemaField prototype ; DynamicField ( SchemaField prototype ) { } SchemaField makeSchemaField ( String name ) { } @ Override public String toString ( ) { } } static class DynamicCopy extends IndexSchema . DynamicReplacement { final SchemaField targetField ; final int maxChars ; DynamicCopy ( String regex , SchemaField targetField ) { } DynamicCopy ( String regex , SchemaField targetField , int maxChars ) { } public SchemaField getTargetField ( String sourceField ) { } @ Override public String toString ( ) { } } static class DynamicDestCopy extends IndexSchema . DynamicCopy { final IndexSchema . DynamicField dynamic ; final int dtype ; final String dstr ; DynamicDestCopy ( String source , IndexSchema . DynamicField dynamic ) { } DynamicDestCopy ( String source , IndexSchema . DynamicField dynamic , int maxChars ) { } @ Override public SchemaField getTargetField ( String sourceField ) { } @ Override public String toString ( ) { } } public SchemaField [ ] getDynamicFieldPrototypes ( ) { } public String getDynamicPattern ( String fieldName ) { } public boolean hasExplicitField ( String fieldName ) { } public boolean isDynamicField ( String fieldName ) { } public SchemaField getFieldOrNull ( String fieldName ) { } public SchemaField getField ( String fieldName ) { SchemaField f = getFieldOrNull ( fieldName ) ; if ( f != null ) return f ; <START_BUG> throw new org . apache . solr . common . SolrException ( ErrorCode . BAD_REQUEST , ( "undefined<seq2seq4repair_space>field<seq2seq4repair_space>" + fieldName ) ) ; <END_BUG> } public FieldType getFieldType ( String fieldName ) { } public FieldType getFieldTypeByName ( String fieldTypeName ) { } public FieldType getFieldTypeNoEx ( String fieldName ) { } public FieldType getDynamicFieldType ( String fieldName ) { } private FieldType dynFieldType ( String fieldName ) { } public SchemaField [ ] getCopySources ( String destField ) { } @ Deprecated public SchemaField [ ] getCopyFields ( String sourceField ) { } public List < CopyField > getCopyFieldsList ( final String sourceField ) { } public boolean isCopyFieldTarget ( SchemaField f ) { } private static boolean isWildCard ( String name ) { } }

Fix:
throw new org . apache . solr . common . SolrException ( ErrorCode . BAD_REQUEST , ( ( "undefined<seq2seq4repair_space>field:<seq2seq4repair_space>\"" + fieldName ) + "\"" ) ) ;